PVS-Studio warning V530 for ITK

template <typename TInputImage, typename TOutputImage>
void
PatchBasedDenoisingImageFilter<TInputImage, TOutputImage>
::EmptyCaches()
{
  for (unsigned int threadId = 0;
       threadId < m_ThreadData.size(); ++threadId)
    {
    SizeValueType cacheSize = ....;
    for (SizeValueType c = 0; c < cacheSize; ++c)
      {
      delete m_ThreadData[threadId].eigenValsCache[c];
      delete m_ThreadData[threadId].eigenVecsCache[c];
      }
    m_ThreadData[threadId].eigenValsCache.empty();
    m_ThreadData[threadId].eigenVecsCache.empty();
    }
}

This suspicious code was found in ITK project by PVS-Studio static code analyzer.
Warning message is:
V530 The return value of function 'empty' is required to be utilized. itkpatchbaseddenoisingimagefilter.hxx 85

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